mirror of
https://github.com/amyinspace/MagicSetEditor2.git
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twanvl
031a0b376e
git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@125 0fc631ac-6414-0410-93d0-97cfa31319b6
123 lines
5.4 KiB
C++
123 lines
5.4 KiB
C++
//+----------------------------------------------------------------------------+
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//| Description: Magic Set Editor - Program to make Magic (tm) cards |
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//| Copyright: (C) 2001 - 2006 Twan van Laarhoven |
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//| License: GNU General Public License 2 or later (see file COPYING) |
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//+----------------------------------------------------------------------------+
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#ifndef HEADER_RENDER_TEXT_VIEWER
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#define HEADER_RENDER_TEXT_VIEWER
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// ----------------------------------------------------------------------------- : Includes
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#include <util/prec.hpp>
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#include <util/rotation.hpp>
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#include <data/field/text.hpp>
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#include <render/text/element.hpp>
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// ----------------------------------------------------------------------------- : TextViewer
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/// Class for viewing and determining positions in formated text
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/** It can:
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* - Draw text to a DC
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* - Draw selection to a DC
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* - Convert between screen coordinates and cursor position
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*
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* To refer to positions in the text this class uses several concepts:
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* - index An index in the input string.
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* For cursor positions char_id = 0 means the cursor is BEFORE character 0
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* - pos The position of a character in real world x,y coordinates (in pixels)
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* The position is the top-left of the character.
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* A char_pos is often only the x coordinate.
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* A line_pos is often only the y coordinate.
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* - Line A line on the screen, this does not neccessarly correspond to explicit linebreaks,
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* since textwrapping also leads to a new line.
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* - line_id The index of a line, 0 is the first line.
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*/
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class TextViewer {
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public:
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/// Information on a line in the textbox
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struct Line;
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TextViewer();
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~TextViewer();
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// --------------------------------------------------- : Drawing
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/// Draw the given text with the given text style
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/** The drawing information is cached,
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* before calling draw again with different text/style reset() should be called
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*/
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void draw(RotatedDC& dc, const TextStyle& style, DrawWhat what);
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/// Draw an indicator for selected text
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void drawSelection(RotatedDC& dc, const TextStyle& style, size_t sel_start, size_t sel_end);
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/// Prepare the text for drawing, if it is not already prepared
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void prepare(RotatedDC& dc, const String& text, const TextStyle& style, Context&);
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/// Reset the cached data, at a new call to draw it will be recalculated
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void reset();
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// --------------------------------------------------- : Positions
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/// Find the character index that is on a line above/below index
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/** If this would move outisde the text, returns the input index */
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size_t moveLine(size_t index, int delta) const;
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/// The character index of the start of the line that character #index is on
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size_t lineStart(size_t index) const;
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/// The character index past the end of the line that character #index is on
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size_t lineEnd (size_t index) const;
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/// Find the index of the character at the given position
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/** If the position is before everything returns 0,
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* if it is after everything returns text.size().
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* The position is in internal coordinates */
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size_t indexAt(const RealPoint& pos) const;
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/// Find the position of the character at the given index
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/** The position is in internal coordinates */
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RealPoint posOf(size_t index) const;
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/// Return the rectangle around a single character
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RealRect charRect(size_t index) const;
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/// Is the character at the given index visible?
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bool isVisible(size_t index) const;
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/// Find the first character index that is at/before/after the given index, and which has a nonzero width
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/** More precisely: it returns a position so that the character after it in the direction delta has nonzero width
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*/
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size_t firstVisibleChar(size_t index, int delta) const;
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/// Return the height of the last line
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double heightOfLastLine() const;
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private:
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// --------------------------------------------------- : More drawing
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double scale; /// < Scale when drawing
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// --------------------------------------------------- : Elements
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TextElements elements; ///< The elements of the prepared text
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/// Find the elements in a string and add them to elements
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void prepareElements(const String&, const TextStyle& style, Context& ctx);
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// --------------------------------------------------- : Lines
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vector<Line> lines; ///< The lines in the text box
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/// Prepare the lines, layout the text
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void prepareLines(RotatedDC& dc, const String& text, const TextStyle& style);
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/// Prepare the lines, layout the text; at a specific scale
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bool prepareLinesScale(RotatedDC& dc, const vector<CharInfo>& chars, const TextStyle& style, bool stop_if_too_long);
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/// Align the lines within the textbox
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void alignLines(RotatedDC& dc, const vector<CharInfo>& chars, const TextStyle& style);
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/// Find the line the given index is on, returns the first line if the index is not found
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const Line& findLine(size_t index) const;
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// helper : get the start coordinate of a line, this is 0 unless there is a contour mask
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double lineLeft (RotatedDC& dc, const TextStyle& style, double y);
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// helper : get the end coordinate of a line, this is width unless there is a contour mask
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double lineRight(RotatedDC& dc, const TextStyle& style, double y);
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};
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// ----------------------------------------------------------------------------- : EOF
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#endif
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